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A screw cwosure is a mechanicaw device which is screwed on and off of a "finish" on a container. Eider continuous dreads or wugs are used. It must be engineered to be cost-effective, to provide an effective seaw (and barrier), to be compatibwe wif de contents, to be easiwy opened by de consumer, often to be recwosabwe, and to compwy wif product, package, and environmentaw waws and reguwations. Some cwosures need to be tamper resistant and have chiwd-resistant packaging features. A tamper-evident band is a common tamper warning for screw caps of bottwes, for exampwe.

Screw caps' use as an awternative to cork for seawing wine bottwes is gaining increasing support. A screw cap is a metaw cap dat screws onto dreads on de neck of a bottwe, generawwy wif a metaw skirt down de neck to resembwe de traditionaw wine capsuwe ("foiw"). A wayer of pwastic (often PVDC), cork, rubber, or oder soft materiaw is used as wad to make a seaw wif de mouf of de bottwe.